Gunsmithing Model 700 Receiver Lug Abutments
- Thread starter Edds
- Start date
Depends.
If it's previously been lapped either with compound or by 30+ years of shooting then probably not much to nothing.
If it's an early freedom group when QC wasn't a thing? Could be a lot. I've heard of 0.03+ on a few. Have only done a handful though, and the ones I've done myself I just put some machine blue on, dab of lapping compound, and worked the bolt. Cleaned, blue, check, lap, etc until I got full contact. None of mine needed very much tough, just a few thousandths.
I also only did mine with new barrels. I'd lap it with the old one, get it as tight as I could using mirror/ scope to check progress. Then I could be 100% sure I got all the compound out when I unscrewed the barrel and had full access for cleaning.
If it's previously been lapped either with compound or by 30+ years of shooting then probably not much to nothing.
If it's an early freedom group when QC wasn't a thing? Could be a lot. I've heard of 0.03+ on a few. Have only done a handful though, and the ones I've done myself I just put some machine blue on, dab of lapping compound, and worked the bolt. Cleaned, blue, check, lap, etc until I got full contact. None of mine needed very much tough, just a few thousandths.
I also only did mine with new barrels. I'd lap it with the old one, get it as tight as I could using mirror/ scope to check progress. Then I could be 100% sure I got all the compound out when I unscrewed the barrel and had full access for cleaning.
With the action correctly dialed in center-line of the bolt raceway, I can't remember the last time I had to take more than a couple thousandths to clean up the receiver lug abutments. After touch off most seem to clean up within a .001" to .0015" YMMV
That's been my experience with the vast majority of the RR prefix 700 actions I've trued. The last several I've bought to build on were bare receivers, and I went with PTG custom bolts in them. Primary extraction has been very good on at least the last six of them with those bolts.
My 5 axis process bounces a probe off the lug abutments and makes an incremental adjustment from there of -.005". In the rarest of circumstances (usually when working on older 40x actions) I have to bump the offset a few more.
Long story short:
With probing and modern machining, this shit is not nearly as "bad" as it's been labeled as. The machine will DPRINT the data and archive it for review. We ran over 1,000 receivers in 2019. They were M7's, M700 SA/LA, and 40x's. M700's do have their share of shortcomings, however, the latest RR prefix pieces coming from the factory are pretty damn good.
New CEO was hired in the spring of 2019. That man put $2,000,000 of his own money into equipment. I have almost "line of sight" with those products as they come off the assembly line.
Remington has done a lot of work to respond to the demands of today.
Long story short:
With probing and modern machining, this shit is not nearly as "bad" as it's been labeled as. The machine will DPRINT the data and archive it for review. We ran over 1,000 receivers in 2019. They were M7's, M700 SA/LA, and 40x's. M700's do have their share of shortcomings, however, the latest RR prefix pieces coming from the factory are pretty damn good.
New CEO was hired in the spring of 2019. That man put $2,000,000 of his own money into equipment. I have almost "line of sight" with those products as they come off the assembly line.
Remington has done a lot of work to respond to the demands of today.
I've watched many, maybe all, of your videos. The receivers coming off of that machine are beautiful. I wish I was smart enough to understand what is beneath the surface. I can't comprehend how electronics, probes, and all that iron bouncing around can maintain accuracy. A piece of metal rotating and being indicated in a lathe, I can comprehend.
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